Bigger tires - better gas mileage? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Number21 · 04-27-2012, 05:39 PM

My truck doesn't have a tach so I calculated the highway engine RPMs at about 2400 with no overdrive, 4.11 gears, and 33" tires. I'm always looking to get better gas mileage, and, I've been considering replacing the 33s with something a bit smaller. On the other hand, that raises my engine RPM.

Would I actually get better MPG with bigger, rather than smaller tires? How would 35s affect my gas mileage? Engine RPM would drop to around 2200 on the highway. As I have 16.5" wheels bigger is definately easier to find....

04-27-2012, 05:39 PM	#1
Number21 Registered User Join Date: Aug 2009 Location: Oregon Posts: 611	Bigger tires - better gas mileage? My truck doesn't have a tach so I calculated the highway engine RPMs at about 2400 with no overdrive, 4.11 gears, and 33" tires. I'm always looking to get better gas mileage, and, I've been considering replacing the 33s with something a bit smaller. On the other hand, that raises my engine RPM. Would I actually get better MPG with bigger, rather than smaller tires? How would 35s affect my gas mileage? Engine RPM would drop to around 2200 on the highway. As I have 16.5" wheels bigger is definately easier to find.... __________________ '73 K20 Cheyenne Super Camper Special 350/TH350/NP205 sittin' on 33's. You can set my truck on fire and roll it down a hill, and I still wouldn't trade it for a Coupe de Ville.



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